Compare user account using shell script

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hi all visitors
i want to write one shell script about user account
how can i compare user account in system and the user that i inputted in shell script?
Thanks

Posted 29-Sep-11 5:45am

soeun tony

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Richard MacCutchan 29-Sep-11 12:20pm

What do you mean by compare? Are you checking the user name as a string, the user's actual id number, or ...?

soeun tony 29-Sep-11 12:36pm

Thanks for your reply
in my shell script, i will let user to input user name.
example: user input new user name is "jonh"
so i want to compare the new user name "jonh" with old user in system.
Thanks

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markkuk · Answer 1 · 2011-09-29T11:29:00

Use the id[^] command, discard any output and check only the exit status. The status is 0 if the username already exists in the user database, 1 if it doesn't exist.
For example, assuming the name to be tested is in the variable $NEWUSER

id $NEWUSER &> /dev/null
if [ $? -eq 0 ]
then
  echo "user $NEWUSER arlready exists"
else
  echo "$NEWUSER is a new name"
fi